I am trying to connect two routers via back-to-back Adtran DSU III AR and
an Adtran 56/64 DSU and am not having any luck. I've set the clock to MASTER
on the DSU III and set both to 56K, but still get open loop on the DSU III.
I made (and tested) the cable with 12-45 crossover, but didn't use other
wires (are they required for anything?). I keep getting Open Loop errors on
the DSU III, although I've tested the cable. Could it need a different
crossed pairs? From reading its manual, it appears to need 12-78 crossed.
Thanks,
Tim
----- Original Message -----
From: "Jay Hennigan" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, May 16, 2000 6:56 PM
Subject: Re: DSU/CSU Back-to-back with T1 crossover
> On Tue, 16 May 2000, Pete Ruttman (adminpr) wrote:
>
> > >I am trying to make a couple of ADTRAN TSU 100 to work with a T1
> > >crossover
> > >cable (pins: 1 to 4 & 2 to 5) but it's not working. Did anybody try
this? I
> > >will appreciate any help....
>
> Do it all the time. Gotta love those alarm pairs.
>
> > 1) did you configure clockrate on the DCE-side of the back-to-back
> connection?
>
> The routers connected to the TSUs will both be DTE. He'll want to set
> clock on one TSU to "Internal" and the other to "Line" (or maybe they call
> it "Network").
>
> > 2) Did you check your adtran manual for info on putting them
back-to-back?
> My adc/kentrox csu/dsus require a dip switch change to work back-to-back.
>
> Really? I've never needed to do that, just set one end to provide clock.
> Maybe the Kentrox ones use a dipswitch, but the TSU series, IIRC, have
> a little LCD display and arrow buttons to navigate it.
>
> Also check that the number of channels (start and end) is the same
> on both, typically start at 1, number of channels 24. and that they're
> both set for the same linecode, framing, and speed. Recommend that you
> use B8ZS, ESF, 64K. Shouldn't be critical as long as they're both set
> the same.
>
> Note that the Ciscos won't probably be happy with frame encaps on this
> setup unless you've configured one of them as a frame switch. Try HDLC
> or PPP.
>
> It would be helpful if you could provide more info than "not working"
> in your message. Things like status light indications on the TSUs,
> interface status on the routers, etc. would be useful.
>
> --
> Jay Hennigan - Network Administration - [EMAIL PROTECTED]
> NetLojix Communications, Inc. NASDAQ: NETX - http://www.netlojix.com/
> WestNet: Connecting you to the planet. 805 884-6323
>
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